kWh to Joules Converter
Instantly convert kilowatt-hours (kWh) to joules (J) and back. Uses the exact relation 1 kWh = 3,600,000 J. Also shows Wh, kJ and MJ. Includes formula, steps, and FAQ.
Full original guide (expanded)
kWh to Joules Converter
Perfect for electricity bills, battery specs, and physics homework. Convert between kilowatt-hour (kWh), watt-hour (Wh), joule (J), kilojoule (kJ), and megajoule (MJ) using the exact energy identity 1 kWh = 3,600,000 J.
Converter
Results
Kilowatt-hours (kWh)
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Watt-hours (Wh)
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Joules (J)
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Kilojoules (kJ)
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Megajoules (MJ)
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Steps
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Why 1 kWh = 3,600,000 J
A watt is a joule per second (1 W = 1 J/s). A kilowatt-hour is power × time:
1 kWh = 1000 W × 3600 s = 1000 × 3600 J = 3,600,000 J
1 kWh = 3.6 × 106 J = 3.6 MJ
So every time you see 1 kWh on an electricity bill, that corresponds to exactly 3.6 megajoules of energy.
Formulas used
kWh → Wh: Wh = kWh × 1000
kWh → J: J = kWh × 3,600,000
J → kWh: kWh = J ÷ 3,600,000
J → kJ: kJ = J ÷ 1000
J → MJ: MJ = J ÷ 1,000,000
FAQ
Is kWh a unit of power or energy?
It’s a unit of energy. Power would be kW. Energy is power × time.
Can I use this for batteries?
Yes — many batteries are in Wh or kWh. Convert to joules to compare with physics calculations.
Formula (LaTeX) + variables + units
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1 kWh = 1000 W × 3600 s = 1000 × 3600 J = 3,600,000 J 1 kWh = 3.6 × 106 J = 3.6 MJ
kWh → Wh: Wh = kWh × 1000 kWh → J: J = kWh × 3,600,000 J → kWh: kWh = J ÷ 3,600,000 J → kJ: kJ = J ÷ 1000 J → MJ: MJ = J ÷ 1,000,000
- No variables provided in audit spec.
- NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures - NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units
Last code update: 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.